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    Process for preparing urea
    4.
    发明授权
    Process for preparing urea 失效
    制备尿素的方法

    公开(公告)号：US3867442A

    公开(公告)日：1975-02-18

    申请号：US21311571

    申请日：1971-12-28

    Applicant: STAMICARBON

    Inventor： LOGEMANN JOHAN D

    IPC: C07C273/04 ,  C07C127/00

    CPC classification number: C07C273/04

    Abstract: A process for manufacturing urea by reacting ammonia and carbon dioxyde is described wherein the ammonium carbamate present in the synthesis effluent is decomposed under high pressure, the gas mixture resulting therefrom is at least partially condensed under a high pressure and the gas-liquid mixture produced in the condensation zone is introduced into the synthesis zone. The ammonia and carbon dioxyde still present in the synthesis solution after the high pressure decomposing of the ammonium carbamate are removed under a low pressure whereby an ammonium carbamate solution is produced, which is used as a washing agent for recovering ammonia and carbon dioxyde from an inerts containing gas mixture discharged from the synthesis zone. The wash solution thus obtained is introduced into the condensation zone, together with a quantity of urea containing solution from the synthesis zone, by means of a jet pump driven by fresh ammonia.

    Abstract translation: 描述了通过氨和二氧化碳反应制备尿素的方法，其中存在于合成流出物中的氨基甲酸铵在高压下分解，由此产生的气体混合物在高压下至少部分冷凝，并将气 - 液混合物 将冷凝区引入合成区。 在低压下除去氨基甲酸铵的高压分解后仍然存在于合成溶液中的氨和二氧化碳，由此产生氨基甲酸铵溶液，其用作从惰性物质中回收氨和二氧化碳的洗涤剂 从合成区排出的气体混合物。 将由此获得的洗涤溶液与来自合成区的含尿素溶液一起通过由新鲜氨驱动的喷射泵引入冷凝区。

    Process and apparatus for the recovery of ammonia and carbon dioxide from the tail gas of a urea synthesis
    5.
    发明授权
    Process and apparatus for the recovery of ammonia and carbon dioxide from the tail gas of a urea synthesis 失效
    从尿素合成尾气中恢复氨和二氧化碳的方法和装置

    公开(公告)号：US3691729A

    公开(公告)日：1972-09-19

    申请号：US3691729D

    申请日：1971-05-26

    Applicant: STAMICARBON

    Inventor： ROOY MICHAEL A DE ,  LOGEMANN JOHAN D ,  KOENDERS HENRICUS A A

    IPC: C01C1/12 ,  C07C273/04 ,  B01D53/00

    CPC classification number: C07C273/04 ,  C01C1/12

    Abstract: A process and apparatus for the recovery of ammonia and carbon dioxide from urea synthesis tail gas is disclosed, wherein the tail gas is intensively contacted with an aqueous media in at least one absorption zone, as is known to the art, and thereafter the gas mixture leaving such absorption zone is immediately mixed with a gas which is inert to the constituents of the tail gas. The apparatus involves a gas bubble washer and an intensive gasliquid contactor, with means for supplying inert gas overlying such contactor. By the use of the present invention the possibility of forming an explosive mixture of the gases leaving the absorption zone is eliminated, or at least minimized.

    Process for the continuous preparation of nitrophosphate fertilizers
    6.
    发明授权
    Process for the continuous preparation of nitrophosphate fertilizers 失效
    连续制备硝酸磷肥的方法

    公开(公告)号：US3600154A

    公开(公告)日：1971-08-17

    申请号：US3600154D

    申请日：1969-02-28

    Applicant: STAMICARBON

    Inventor： SLOT WILLEM ,  LOGEMANN JOHAN D

    IPC: C05B11/06

    CPC classification number: C05B11/06 ,  C05B11/08

    Abstract: AN IMPROVED PROCESS FOR THE CONTINUOUS PREPARATION OF A NITROPHOSPHATE FERTILIZER WHEREIN PHOSPHATE ROCK IS DECOMPOSED IN AN AQUEOUS SOLUTION CONTAINING SUFFICIENT NITRIC ACID TO DISSOLVE THE PHOSPHATE ROCK, SULPHURIC ACID IS THEN ADDED TO THE SOLUTION IN A SUFFICIENT AMOUNT TO PRECIPITATE GYPSUM WITH THE SIMULTANEOUS REFORMATION OF NITRIC ACID, ADDITIONAL PHOSPHATE ROCK IS THEN ADDED TO THE SOLUTION AND DISSOLVED BY THE REFORMED NITRIC ACID, AMMONIUM SULPHATE IS THEN ADDED TO

    THE SOLUTION TO REACT WITH THE DISSOLVED CALCIUM IONS OBTAINED IN DISSOLVING THE ADDITIONAL PHOSPHATE ROCK, THEREBY PRECIPITATING ADDITIONAL GYPSUM, THE PRECIPITATED GYPSUM IS THEN SEPARATED FROM THE SOLUTION, AND THE GYPSUM-FREE SOLUTION IS THEN NEUTRALIZED WITH AMMONIA AND EVAPORATED TO DRYNESS TO FORM A SOLID FERTILIZER COMPOSITION.

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